Driving-chuck for railway-wheel lathes



0. D..ANDREI"' DRIVING CHUCK FOR RAILWAY WHEEL LATHvE-S'.

APPLICATION ICILED AUG23p 19'20.

Patented Mar. 1, 1921,

2 SHEETS-SHEET I.

INV I'. NTUR en?,

ATVTORNI.)

:if/'0. D; ANDREW.

D RviNG"cHu-c-K Foa RAlLwAY'wHEEL LATHEs. l APPLICATION FILED AUGv.-23. 1920.

C' v.21H5zzd'l'oselal) UNITED STATES CECIL DANIEL ANDREW, or MANCHESTER, ENGLAND, AssiGNoR To sin W. Gr.ARM-

sTnoNefl wHiTwoRTH AND COMPANY, LIMITED, or NnwcAsTLE-UPoNATYNE;ENG-

LAND.

To all whom 'it may concern. f

Be it known that I, CECIL DANIEL A N- DREW, a subject of the King of Great Britain and Ireland, and residing atIQYBury Old Road, Manchester, in the county of Lancaster, England, 'have invented certain new and useful Improvementsin'and Relating to Driving-Chucks for Railway-Wheel Lathes, 'of which the following is a specification; n f

This invention relates to driving dogs or chucks for 'railway wheel lathes and the like, and has for object to provide means whereby spoked railway and like wheels may be chucked and driven in such manner that thewheel shall not 'be' distorted or sprung out of its true relation with the axle while being turned. Y f

According' to the invention the wheel is held in position bya plurality of driving dogs, each of which is adapted to grip the wheel rim oralternatively thetire mounted on the wheelr center, at points situated on opposite faces of the rim or tire and substantially in line one with the other, in such a manner that the gripping pressure on one side of the wheel rim or tire shall automatically balance the gripping pressure upon the opposite side thereof. l K

Thus, in accordance withf the i-nvention7 `a Vplurality of driving dogs in the form of cramps or clamps having oppositely disposed jaws are employed for grippingfthe rim or tire in the manner speciied, saidA cramps or clamps being secured to the face plate of the lathe by brackets.

For example, each of the crampsor clamps may be secured to a driving bracket arranged on the face plate (which bracket is convenientlyarranged so as to be capable of movement tangentially thereto) by means of a locking boltv which passes through a slot in the driving bracket and through the cramp or clamp and forms the ,pivoting point therefor.

These slots are provided iirst'for the purpose of carrying the pivotin point of the cramp or clamp as far bac when engaging or disengaging the latter sov Specification of Letters Patent.

DRIVING-CHUCK FOR 'RAILWAY-WHEEL as to give clearance for the link connecting the Jawsof the cramp'or clamp to be swung betweenthe spokes Vof wheels of smallA diwork from the lathe.

PateiitedMar. 1, 1921. Application filed August 23, 1e2o. serial No. 405,464. Y y

The invention valso comprises the provision i 5 of means-whereby locomotive driving wheels and the like Vwhich are V'providedjwithbalance weights maybe secured to the face plate lof the lathe by cramps or clamps Ain the manner abovedescribed and may also l spokes is filled bythe balance weight.

according to the invention, one or more, plain gripping dogs are substituted for thel clamps above described for supporting'the wheel at such points, said' dogs being associated with means whereby they maybe moved in a direction awayY from the faceV plate to cause these plain gripping dogs to bear against the adjacent face of the wheel center or tire. As means for causing these plain gripping dogs to bear'against the adjacent face -be supportedas itis advisablerthat'they. vshould be, where the space between the threaded aperture inthe. dog, aslot being provided in the bracket'for "facilitating the operation of the jack-screw forV the purpose of adjusting the position ofthe dog in relation to the'iace of the wheel center or rim.

No novelty is claimed in connection with the use of these plain gripping dogs and j ack-screws (which are already employed rin practice) except in so far. as they are employed in combination with the cramps or clamps which iorm the subject of the invention as hereinbefore described.

When the invention is made use of in connection with a wheel provided with balance weights, two dogs in the form of Vclamps secured to brackets lon the face plate are rst caused to engage the wheel rim by passing the free ends of these clamps between the open s aces between adjacent spokes and then the plain gripping dogs are adjusted to assist in driving the wheel and steadying the work.

Ordinarily four driving dogs will be provided on each face plate of the lathe.

The invention is illustrated by way of example in theA accompanying drawings, in which Fig'ures 1, 2, and 3 are views in three different planes of a driving dog in the form of a cramp or clamp, and

Figs. 4 and 5 are views, the latter in section, of a plain gripping dog for supporting the wheel at a point adjacent to the balance weight.

Referring to Figs. 1 to 3, 1, 1a are the yjaws of the cramp, 2 the body thereof, 3

the'jscrew for use 1n adjustingthe position of the movable jaw inorder to grip'the wheel which is being operated upon, 4the driving bracket by which the cramp is secured to the face plate, 5 is the locking bolt which passes through a slot 6 in the driving bracket and through the cramp or clamp and forms the pivotingpoint therefor, 7 is a screw adapted to traverse the bracket in the guides 8 secured to the face plate and thus to cause the bracket to move tangentially to the latter.

Referring to Figs. 4 and 5, 9 is the gripping dog which is secured in the bracket 10 by means of the bolt 11, 12 being a jackscrew, one end of which is arranged to bear against the face plate at 13, and the other end beingengaged in a screw-threaded aperture in the dog, the slot 14 being vprovided for facilitating the operation of the jackscrew for lthe purpose of adjusting the position of the dog in relation to the face of the wheel center or rim.

VThe invention provides a practical and simple means of overcoming a diliiculty,

which up to now has' been inherent in all Wheel lathes having rigid connection between the face plate and the work, as no to secure rigid attachment of the work to the face plate of the lathe, and at the same time to eliminateiall tendency of distortion of the work.

Having now described my invention what I claim as new and desire to secure by Letters Patent is l. In a railway wheel lathe, a bracket provided-with means for securing the same tov 1, the provision of a recess in said bracket designed lto receive the yoke-shaped member and of vsuiiicient size to permit Ythe yokeshaped member to be swung entirely clear of the wheel beingv operated upon. f,

. 3. A lathe of the kind defined byy claim 1 in which the bracket is of substantially U- shaped cross-section to provide a recess of of the yoke-shaped member and to permit theV yoke-shaped member to be swung clear of the wheel/being operated upon. 4. In a railway wheel latheha vbracket adapted to b e secured to the `face-plate of the lathe, a unitary clamp pivotally mounted on said bracket and provided with astationary jaw, a jaw movable towardl and away from the stationary jaw, Vand means foradjusting the'bracket -in a plane subsufficient depth to receive the major portion f stantially at right angles to the plane of A movement of the clamp about its pivot pin.

5. A lathe ofthe kind defined by claim 1 having a guide member in which-the bracket is slidably mounted, and means for adjusting the bracket in the guide member` in a plane substantially at right angles -to the plane of movement of the'yoke-shaped meml ber. means has been provided up to the present In testimony whereof have signed my name4 to vthis specification. l.

` CECILV DANIEL ANDREW. 

